Abstract
The development of a liquid‐immersible megahertz‐range electrostatic acoustic transducer was previously reported. The transducer consists of a thin conductive membrane stretched over an electrically isolated cylindrical electrode recessed approximately 10 μ from the membrane inner surface. The transducer is shown to be capable of measuring absolute ultrasonic displacement amplitudes in the subangstrom range. This capability, combined with Raman‐Nath light diffraction measurements, permits the measurement of the piezo‐optic coefficients of liquids. Measurements of the piezo‐optic coefficient in distilled water as a function of temperature are reported. The results are compared with values obtained from other techniques.
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